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HelpTest ID OSG_F Osmotic Gap, Feces
Ordering Guidance
This test is only clinically valid if performed on watery specimens. In the event a formed fecal specimen is submitted, the test will not be performed.
Specimen Required
Patient Preparation: No barium, laxatives, or enemas may be used for 96 hours prior to start of, or during, collection.
Supplies: Stool containers - 24, 48, 72 Hour Kit (T291)
Collection Container/Tube: Stool container
Specimen Volume: 10 g
Collection Instructions: Collect a very liquid fecal specimen.
Secondary ID
610305Useful For
Workup of cases of chronic diarrhea
Differentiating osmotic from non-osmotic causes of chronic diarrhea.
Specimen Type
FecalSpecimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Fecal | Frozen (preferred) | 14 days |
| Refrigerated | 7 days | |
| Ambient | 48 hours |
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Reference Values
An interpretive report will be provided
Performing Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
84302-Sodium
84999-Potassium
Day(s) Performed
Monday, Thursday